Justification of Red List Category
Although this species may have a restricted range, it is not believed to approach the thresholds for Vulnerable under the range size criterion (extent of occurrence <20,000 km2 combined with a declining or fluctuating range size, habitat extent/quality, or population size and a small number of locations or severe fragmentation). Despite the fact that the population trend appears to be decreasing, the decline is not believed to be sufficiently rapid to approach the thresholds for Vulnerable under the population trend criterion (>30% decline over ten years or three generations). The population size has not been quantified, but it is not believed to approach the thresholds for Vulnerable under the population size criterion (<10,000 mature individuals with a continuing decline estimated to be >10% in ten years or three generations, or with a specified population structure). For these reasons the species is evaluated as Least Concern.
The global population size has not been quantified, but the species is reported to be a common resident (MacKinnon and Phillipps 2000), while the population in Taiwan has been estimated at c.100-10,000 breeding pairs (Brazil 2009).
The population is suspected to be in decline owing to ongoing habitat destruction and fragmentation.
Text account compilers
Ekstrom, J., Butchart, S. & Ashpole, J
BirdLife International (2023) Species factsheet: Sibia morrisoniana. Downloaded from http://www.birdlife.org on 05/02/2023. Recommended citation for factsheets for more than one species: BirdLife International (2023) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 05/02/2023.